/usr/share/doc/texlive-doc/lualatex/xindex/tests/demo3.ind

\begin{theindex}

\indexspace
\textbf{F}\label{L-xindex-F}
\nopagebreak[4]
  \item foo, {1f}, \textit{2}, \textbf{3}, {4}
\end{theindex}

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